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excited state: state in which an atom or molecule picks up outside energy, causing an electron to move into a higher-energy orbital.
Electron shell is a group of atomic orbital, so that their orbits formed electron shell with the same value of the principal quantum number. The 1, 2, 3, 4 electron shell can hold 2, 8, 18, 32 electrons respectively, since the electrons are electrically attracted to the nucleus.